McQuay RMS Installation Manual

MicroTech® RMS Sensor Kit

General Description

The RMS Sensor Kit provides a zone temperature sensor and outside-air temperature-sensor for the RMS Panel.

Inspection

Verify that all required parts have been included:

Quantity Item Description

Installation & Maintenance Data

IM 501

: Controls

Group

Part Number

: August 1997

Date

552192Y-03

1 Outside Air Temperature Sensor

1 Zone Temperature Sensor

1 Gray PVC Mounting Track

1 Printed Circuit Board

1 Ribbon Cable (10 Conductor)

2 #8 Sheet Metal Screws

Installation

Printed Circuit Board

Fasten the PVC mounting track to the lower right corner of the panel as shown in Figure 1. Use the two #8 sheet metal screws provided.

Attach the PC board to the PVC track so that the ribbon connector is adjacent to the microprocessor. Place one end of the board in the track, and apply a slight downward pressure at the other to snap the board in place.

Connect the ribbon cable as indicated (the connectors have a polarizing nose to assure correct position). A downward pressure on each connector engages the locking tabs. Check to be sure that the connector is locked by pressing the locking tabs between your thumb and forefinger.

Zone Temperature Sensor

Follow the installation instructions in Bulletin No. IM 529-3, “MicroTech Room Temperature Sensors,” which is included with the sensor. Note that Table 1 of IM 529 indicates that three conductors are required for the sensor included in this kit (Standard sensor #1); however, for this application, only two conductors are required.

Wire the sensor as shown in Figure 2. Use a twisted, shielded pair cable (Belden 8762 or equivalent).

Figure 1. RMS Panel

ANALOG INPUTS

Figure 2. Zone Temperature Sensor Connection

Microprocessor

Mounting Track Ribbon Cable

PC Board

a0065

PC Board

Strip back and tape shield at

sensor to prevent contact.

Belden Cable 8762 or Equivelant Maximum Cable Length = 500 ft.

4-20 mA or 0-5 Vdc

a0068

Outside Air Temperature Sensor

Locate the outdoor-air temperature-sensor in a shaded area away from devices such as exhaust fans. The preferred location is under a roof soffit on a north-facing wall.

Position the junction box horizontally as indicated in Figure 3 with the sensor shield on either the left or right. The shield can be rotated by hand so that the angled end always faces down. Do not mount the sensor in the vertical position.

Wire the sensor as shown in Figure 4. Use a twisted, shielded pair cable (Belden 8762 or equivalent). Do not cut or shorten the 8-foot wire leads provided with the sensor (the lead length prevents moisture from entering the sensor element). Using the insulation displacement type connectors provided, terminate the wires at the sensor by inserting the unstripped wires into the connector and pressing the red button into the connector body with a pliers.

2 IM 501

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